There are many kinds of speakers on the market. Recently, the big heat should be Bluetooth smart speakers, little love, Tmall elves, Xiaoli, these cost-effective smart speakers swept market. Organize the plan of 8 speakers on the Circuit City, if you are interested in the speaker, don't miss it.
1, pure simulation Bluetooth wireless stereo headphone speaker audio system (circuit diagram)
Product function description:
This system consists of Bluetooth audio receiving board module, LM386 power amplifier, and power supply.
1. Implement the audio information wireless Bluetooth play by Bluetooth audio module and mobile Bluetooth.
2, can control the left channel and right channel by the turret switch.
3. The headphone mode or external power amplifier mode can be controlled by the turret switch.
https://www.cirmall.com/circuit/19330
2, FFT colorful light music Bluetooth speaker
The STM32 is used as the master chip, the FFT algorithm is low, medium, high frequency divide, and the body line is brightness brightness in the RGB lamp three lamps, and transforms different colors with music.
Integrated charging circuit, wireless Bluetooth and amplifier circuit, touch control circuit.
Provide 3D print files, and source code.
https://www.cirmall.com/circuit/15284
3, graduation design - 10% discount on smart Bluetooth speakers based on speech recognition
Using the popular LD3320 speech recognition scheme based on the market, use non-specific human speech recognition (ASR) technology to debug the specific vocabulary required for this topic. The master chip STM32F103C8T6 is used to serve serial communication with the LD3320 speech recognition module. The master chip receives the serial key Pinyin and processes the message command. The keywords needed for this topic include: awakening the word, the next, the last, the loud point, the small voice point, mute.
This topic selection JDY-64 is designed for low power lossless two-channel stereo schemes, just access the module to the application product, you can quickly implement wireless music transmission, which uses Bluetooth 4.2, support HFPv1.7, A2DPv1.2 Avrcpv1.5, AVCTPV1.2, AVDTPV1.2 Bluetooth protocol, can receive audio signals of different devices to meet daily requirements.
Https://www.cirmall.com/circuit/12676
4,51 single-chip liquid crystal display music box music player audio speaker system 11- (PCB + source + circuit diagram + paper)
Product function description:
The system is composed of STC89C52 consisting of a single chip, an LM386 power amplifier, a liquid crystal LCD1602 display, a button control, and a power source.
1. Drive the speaker via the LM386 power amplifier chip, and the sound volume size can be adjusted by the blue white potentiometer.
2. The potentiometer next to the liquid crystal is to adjust the LCD1602 liquid crystal contrast.
3, the single-chip built-in 8 songs, the button can be on the previous song, start or suspend, the next song.
4, LCD1602 shows the name of the song name, the fireworks are easy, send like snow, simple love, only mothers in the world, when you are lonely, you will think of who, country road, farewell, the most romantic thing.
Https://www.cirmall.com/circuit/17861
5. TWS Bluetooth speaker design scheme based on Qualcomm QCC3031 Class1
QCC3031 is an entry-level programmable design Bluetooth audio SOC designed for optimized Bluetooth speakers. Based on the very low power architecture, support Qualcomm APTXTM and APTX HD audio, and can turn on the TWS function to output the left and right channel to two QCC3031 Bluetooth speakers and then cooperate with Qualcomm unique control to open the external 2.4 GHz Transmit / Receive RF chip will output Power is increased, supporting up to 1.8A charging current design, making music enjoy the interruption and distance.
https://www.cirmall.com/circuit/15502
6. TWS Bluetooth speaker scheme based on torch core (Actions) ATS2819
Mold design total instructions
1 As a Bluetooth speaker scheme, the mold design should fully consider the design of the speaker sound cavity. This requires professional speaker designers to participate in the mold design. The assembly sealing properties of the cavity must not be leaked.
2 There is a Bluetooth call function, and the module is best to ensure good isolation between Speaker and MIC, reducing the speaker sound to the micro, resulting in deterioration of Bluetooth calls. Therefore, both the speakers and MICs need to be sealed with sealants. Moreover, Speaker and MIC are preferably not placed on the same side. Otherwise, it will also affect through the effect.
3 For Speaker's choice, the linearity of the speaker sound is better within 4kHz.
4 If there is a cavity, you need to treat the cavity as a speaker.
5 Mold design with Bluetooth products When designing the location and direction of the Bluetooth antenna, the space around the antenna cannot have the interference article. Includes metals such as Speaker and metal housing; there are also cables such as speakers, power supply and so on. In the case of ensuring good launch of antenna, it is considered to make a partial metal housing and PCB, and improve ESD performance.
https://www.cirmall.com/circuit/15303
7, pure simulation Bluetooth wireless stereo headphone speaker audio system 17- (PCB + circuit diagram + paper)
Product function description:
This system consists of Bluetooth audio receiving board module, LM386 power amplifier, and power supply.
1. Implement the audio information wireless Bluetooth play by Bluetooth audio module and mobile Bluetooth.
2, can control the left channel and right channel by the turret switch.
3. The headphone mode or external power amplifier mode can be controlled by the turret switch.
https://www.cirmall.com/circuit/17837
8, Class D PROUNDAL SME Speaker
10W left and right channel Bluetooth DIY small speaker
Bluetooth CRS8635 module
Double 10W
5-12V power supply
Bluetooth connection
Upgraded version
Bluetooth uses QC3008, support Bluetooth 5.0, stereo, APTX, TWS
Optimize the TPA3136D2 load filtering section, the effect is better
Different frequency tone, double bass radiator
https://www.cirmall.com/circuit/12255
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